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Don't allocate memory in LiveInterval::join().
Rewrite value numbers directly in the 'Other' LiveInterval which is moribund anyway. This avoids allocating the OtherAssignments vector. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175690 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -464,10 +464,12 @@ void LiveInterval::join(LiveInterval &Other,
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ranges.erase(OutIt, end());
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}
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// Remember assignements because val# ids are changing.
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SmallVector<unsigned, 16> OtherAssignments;
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// Rewrite Other values before changing the VNInfo ids.
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// This can leave Other in an invalid state because we're not coalescing
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// touching segments that now have identical values. That's OK since Other is
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// not supposed to be valid after calling join();
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for (iterator I = Other.begin(), E = Other.end(); I != E; ++I)
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OtherAssignments.push_back(RHSValNoAssignments[I->valno->id]);
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I->valno = NewVNInfo[RHSValNoAssignments[I->valno->id]];
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// Update val# info. Renumber them and make sure they all belong to this
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// LiveInterval now. Also remove dead val#'s.
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@ -487,13 +489,8 @@ void LiveInterval::join(LiveInterval &Other,
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// Okay, now insert the RHS live ranges into the LHS.
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LiveRangeUpdater Updater(this);
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unsigned RangeNo = 0;
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for (iterator I = Other.begin(), E = Other.end(); I != E; ++I, ++RangeNo) {
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// Map the valno in the other live range to the current live range.
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VNInfo *VNI = NewVNInfo[OtherAssignments[RangeNo]];
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assert(VNI && "Adding a dead range?");
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Updater.add(I->start, I->end, VNI);
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}
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for (iterator I = Other.begin(), E = Other.end(); I != E; ++I)
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Updater.add(*I);
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}
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/// MergeRangesInAsValue - Merge all of the intervals in RHS into this live
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